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From earthquakes in Nepal to volcanic eruptions in Chile, from meteors crashing to Earth to the songs of migrating whales in the Indian Ocean, The Global Ear hears all.

This universal system of looking, listening and sniffing the Earth is the work of an international organization, the Comprehensive Nuclear-Test-Ban Treaty Organization or CTBTO.

The CTBTO designed and began installing its monitoring network 18 years ago to detect nuclear explosions above ground and underneath. The network is a way to guard against test ban treaty violations. The Comprehensive Nuclear-Test-Ban Treaty (CTBT) bans nuclear explosions by everyone, everywhere: in the atmosphere, underwater and underground.